svg stuff

1 files changed, 150 insertions, 0 deletions

diff --git a/Zotlabs/Lib/SvgSanitizer.php b/Zotlabs/Lib/SvgSanitizer.php
new file mode 100644
index 000000000..c9bafc464
--- /dev/null
+++ b/Zotlabs/Lib/SvgSanitizer.php
@@ -0,0 +1,150 @@
+<?php
+
+namespace Zotlabs\Lib;
+use DomDocument;
+
+/**
+ *  SVGSantiizer
+ * 
+ *  Whitelist-based PHP SVG sanitizer.
+ * 
+ *  @link https://github.com/alister-/SVG-Sanitizer}
+ *  @author Alister Norris
+ *  @copyright Copyright (c) 2013 Alister Norris
+ *  @license http://opensource.org/licenses/mit-license.php The MIT License
+ *  @package svgsanitizer
+ */
+
+class SvgSanitizer {
+	
+	private $xmlDoc;				// PHP XML DOMDocument
+
+	private $removedattrs = [];
+
+	private static $allowed_functions = [ 'matrix', 'url', 'translate', 'rgb' ];
+
+	// defines the whitelist of elements and attributes allowed.
+	private static $whitelist = [
+		'a' => [ 'class', 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'id', 'mask', 'opacity', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform', 'href', 'xlink:href', 'xlink:title' ],
+		'circle' => [ 'class', 'clip-path', 'clip-rule', 'cx', 'cy', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'id', 'mask', 'opacity', 'r', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform' ],
+		'clipPath' => [ 'class', 'clipPathUnits', 'id' ],
+		'defs' => [ ],
+	    'style' => [ 'type' ],
+		'desc' => [ ],
+		'ellipse' => [ 'class', 'clip-path', 'clip-rule', 'cx', 'cy', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'id', 'mask', 'opacity', 'requiredFeatures', 'rx', 'ry', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform' ],
+		'feGaussianBlur' => [ 'class', 'color-interpolation-filters', 'id', 'requiredFeatures', 'stdDeviation' ],
+		'filter' => [ 'class', 'color-interpolation-filters', 'filterRes', 'filterUnits', 'height', 'id', 'primitiveUnits', 'requiredFeatures', 'width', 'x', 'xlink:href', 'y' ],
+		'foreignObject' => [ 'class', 'font-size', 'height', 'id', 'opacity', 'requiredFeatures', 'style', 'transform', 'width', 'x', 'y' ],
+		'g' => [ 'class', 'clip-path', 'clip-rule', 'id', 'display', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform', 'font-family', 'font-size', 'font-style', 'font-weight', 'text-anchor' ],
+		'image' => [ 'class', 'clip-path', 'clip-rule', 'filter', 'height', 'id', 'mask', 'opacity', 'requiredFeatures', 'style', 'systemLanguage', 'transform', 'width', 'x', 'xlink:href', 'xlink:title', 'y' ],
+		'line' => [ 'class', 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'id', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform', 'x1', 'x2', 'y1', 'y2' ],
+		'linearGradient' => [ 'class', 'id', 'gradientTransform', 'gradientUnits', 'requiredFeatures', 'spreadMethod', 'systemLanguage', 'x1', 'x2', 'xlink:href', 'y1', 'y2' ],
+		'marker' => [ 'id', 'class', 'markerHeight', 'markerUnits', 'markerWidth', 'orient', 'preserveAspectRatio', 'refX', 'refY', 'systemLanguage', 'viewBox' ],
+		'mask' => [ 'class', 'height', 'id', 'maskContentUnits', 'maskUnits', 'width', 'x', 'y' ],
+		'metadata' => [ 'class', 'id' ],
+		'path' => [ 'class', 'clip-path', 'clip-rule', 'd', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'id', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform' ],
+		'pattern' => [ 'class', 'height', 'id', 'patternContentUnits', 'patternTransform', 'patternUnits', 'requiredFeatures', 'style', 'systemLanguage', 'viewBox', 'width', 'x', 'xlink:href', 'y' ],
+		'polygon' => [ 'class', 'clip-path', 'clip-rule', 'id', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'id', 'class', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'points', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform' ],
+		'polyline' => [ 'class', 'clip-path', 'clip-rule', 'id', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'points', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform' ],
+		'radialGradient' => [ 'class', 'cx', 'cy', 'fx', 'fy', 'gradientTransform', 'gradientUnits', 'id', 'r', 'requiredFeatures', 'spreadMethod', 'systemLanguage', 'xlink:href' ],
+		'rect' => [ 'class', 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'height', 'id', 'mask', 'opacity', 'requiredFeatures', 'rx', 'ry', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform', 'width', 'x', 'y' ],
+		'stop' => [ 'class', 'id', 'offset', 'requiredFeatures', 'stop-color', 'stop-opacity', 'style', 'systemLanguage' ],
+		'svg' => [ 'class', 'clip-path', 'clip-rule', 'filter', 'id', 'height', 'mask', 'preserveAspectRatio', 'requiredFeatures', 'style', 'systemLanguage', 'viewBox', 'width', 'x', 'xmlns', 'xmlns:se', 'xmlns:xlink', 'y' ],
+		'switch' => [ 'class', 'id', 'requiredFeatures', 'systemLanguage' ],
+		'symbol' => [ 'class', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'font-family', 'font-size', 'font-style', 'font-weight', 'id', 'opacity', 'preserveAspectRatio', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'transform', 'viewBox' ],
+		'text' => [ 'class', 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'font-family', 'font-size', 'font-style', 'font-weight', 'id', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'text-anchor', 'transform', 'x', 'xml:space', 'y' ],
+		'textPath' => [ 'class', 'id', 'method', 'requiredFeatures', 'spacing', 'startOffset', 'style', 'systemLanguage', 'transform', 'xlink:href' ],
+		'title' => [ ],
+		'tspan' => [ 'class', 'clip-path', 'clip-rule', 'dx', 'dy', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'font-family', 'font-size', 'font-style', 'font-weight', 'id', 'mask', 'opacity', 'requiredFeatures', 'rotate', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'systemLanguage', 'text-anchor', 'textLength', 'transform', 'x', 'xml:space', 'y' ],
+		'use' => [ 'class', 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'height', 'id', 'mask', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'style', 'transform', 'width', 'x', 'xlink:href', 'y' ],
+	];
+
+	function __construct() {
+		$this->xmlDoc = new DOMDocument('1.0','UTF-8');
+		$this->xmlDoc->preserveWhiteSpace = false;
+		libxml_use_internal_errors(true);
+	}
+
+	// load XML SVG
+	function load($file) {
+		$this->xmlDoc->load($file);
+	}
+
+	function loadXML($str) {
+		if (! $this->xmlDoc->loadXML($str)) {
+			logger('loadxml: ' . print_r(libxml_get_errors(),true), LOGGER_DEBUG);
+			return false;
+		}
+		return true;
+	}
+
+	function sanitize()
+	{
+		// all elements in xml doc
+		$allElements = $this->xmlDoc->getElementsByTagName('*');
+
+		// loop through all elements
+		for($i = 0; $i < $allElements->length; $i++)
+		{
+			$this->removedattrs = [];
+			
+			$currentNode = $allElements->item($i);
+
+			// logger('current_node: ' . print_r($currentNode,true));
+
+			// array of allowed attributes in specific element
+			$whitelist_attr_arr = self::$whitelist[$currentNode->tagName];
+
+			// does element exist in whitelist?
+		    if(isset($whitelist_attr_arr)) {
+					$total = $currentNode->attributes->length;
+					
+		    		for($x = 0; $x < $total; $x++) {
+
+		    			// get attributes name
+		    			$attrName = $currentNode->attributes->item($x)->nodeName;
+
+						// logger('checking: ' . print_r($currentNode->attributes->item($x),true));
+						$matches = false;
+						
+		    			// check if attribute isn't in whitelist
+		    			if(! in_array($attrName, $whitelist_attr_arr)) {
+							$this->removedattrs[] = $attrName;
+		    			}
+						// check for disallowed functions
+						elseif (preg_match_all('/([a-zA-Z0-9]+)[\s]*\(/',
+							$currentNode->attributes->item($x)->textContent,$matches,PREG_SET_ORDER)) {
+							if ($attrName === 'text') {
+								continue;
+							}
+							foreach ($matches as $match) {
+								if(! in_array($match[1],self::$allowed_functions)) {
+									logger('queue_remove_function: ' . $match[1],LOGGER_DEBUG);
+									$this->removedattrs[] = $attrName;
+								}
+							}
+						}
+		    		}	
+					if ($this->removedattrs) {
+						foreach ($this->removedattrs as $attr) {
+							$currentNode->removeAttribute($attr);
+							logger('removed: ' . $attr, LOGGER_DEBUG);
+						}
+					}
+
+			}
+
+		    // else remove element
+		    else {
+				logger('remove_node: ' . print_r($currentNode,true));
+		        $currentNode->parentNode->removeChild($currentNode);
+		    }	
+		}
+		return true;
+	}
+
+	function saveSVG() {
+		$this->xmlDoc->formatOutput = true;
+		return($this->xmlDoc->saveXML());
+	}
+}